mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-09-09 09:03:20 +02:00
698 lines
18 KiB
C
698 lines
18 KiB
C
/**
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* gekko_io.c - Gekko style disk io functions.
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*
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* Copyright (c) 2009 Rhys "Shareese" Koedijk
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* Copyright (c) 2010 Dimok
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#ifdef HAVE_MATH_H
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#include <math.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#include "ntfs.h"
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#include "types.h"
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#include "logging.h"
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#include "device_io.h"
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#include "gekko_io.h"
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#include "cache.h"
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#include "device.h"
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#include "bootsect.h"
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#define DEV_FD(dev) ((gekko_fd *)dev->d_private)
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/* Prototypes */
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static s64 ntfs_device_gekko_io_readbytes( struct ntfs_device *dev, s64 offset, s64 count, void *buf );
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static bool ntfs_device_gekko_io_readsectors( struct ntfs_device *dev, sec_t sector, sec_t numSectors, void* buffer );
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static s64 ntfs_device_gekko_io_writebytes( struct ntfs_device *dev, s64 offset, s64 count, const void *buf );
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static bool ntfs_device_gekko_io_writesectors( struct ntfs_device *dev, sec_t sector, sec_t numSectors, const void* buffer );
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/**
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*
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*/
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static int ntfs_device_gekko_io_open( struct ntfs_device *dev, int flags )
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{
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ntfs_log_trace( "dev %p, flags %i\n", dev, flags );
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD( dev );
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if ( !fd )
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{
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errno = EBADF;
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return -1;
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}
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// Get the device interface
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const DISC_INTERFACE* interface = fd->interface;
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if ( !interface )
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{
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errno = ENODEV;
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return -1;
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}
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// Start the device interface and ensure that it is inserted
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if ( !interface->startup() )
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{
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ntfs_log_perror( "device failed to start\n" );
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errno = EIO;
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return -1;
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}
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if ( !interface->isInserted() )
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{
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ntfs_log_perror( "device media is not inserted\n" );
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errno = EIO;
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return -1;
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}
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// Check that the device isn't already open (used by another volume?)
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if ( NDevOpen( dev ) )
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{
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ntfs_log_perror( "device is busy (already open)\n" );
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errno = EBUSY;
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return -1;
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}
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// Check that there is a valid NTFS boot sector at the start of the device
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NTFS_BOOT_SECTOR boot;
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if ( interface->readSectors( fd->startSector, 1, &boot ) )
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{
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if ( !ntfs_boot_sector_is_ntfs( &boot ) )
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{
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errno = EINVALPART;
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return -1;
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}
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}
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else
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{
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ntfs_log_perror( "read failure @ sector %d\n", fd->startSector );
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errno = EIO;
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return -1;
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}
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// Parse the boot sector
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fd->hiddenSectors = le32_to_cpu( boot.bpb.hidden_sectors );
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fd->sectorSize = le16_to_cpu( boot.bpb.bytes_per_sector );
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fd->sectorCount = sle64_to_cpu( boot.number_of_sectors );
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fd->pos = 0;
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fd->len = ( fd->sectorCount * fd->sectorSize );
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fd->ino = le64_to_cpu( boot.volume_serial_number );
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// Mark the device as read-only (if required)
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if ( flags & O_RDONLY )
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{
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NDevSetReadOnly( dev );
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}
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// Create the cache
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fd->cache = _NTFS_cache_constructor( fd->cachePageCount, fd->cachePageSize, interface, fd->startSector + fd->sectorCount, fd->sectorSize );
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// Mark the device as open
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NDevSetBlock( dev );
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NDevSetOpen( dev );
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return 0;
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}
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/**
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*
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*/
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static int ntfs_device_gekko_io_close( struct ntfs_device *dev )
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{
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ntfs_log_trace( "dev %p\n", dev );
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD( dev );
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if ( !fd )
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{
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errno = EBADF;
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return -1;
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}
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// Check that the device is actually open
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if ( !NDevOpen( dev ) )
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{
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ntfs_log_perror( "device is not open\n" );
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errno = EIO;
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return -1;
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}
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// Mark the device as closed
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NDevClearOpen( dev );
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NDevClearBlock( dev );
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// Flush the device (if dirty and not read-only)
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if ( NDevDirty( dev ) && !NDevReadOnly( dev ) )
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{
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ntfs_log_debug( "device is dirty, will now sync\n" );
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// ...?
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// Mark the device as clean
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NDevClearDirty( dev );
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}
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// Flush and destroy the cache (if required)
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if ( fd->cache )
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{
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_NTFS_cache_flush( fd->cache );
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_NTFS_cache_destructor( fd->cache );
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}
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// Shutdown the device interface
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/*const DISC_INTERFACE* interface = fd->interface;
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if (interface) {
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interface->shutdown();
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}*/
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// Free the device driver private data
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ntfs_free( dev->d_private );
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dev->d_private = NULL;
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return 0;
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_seek( struct ntfs_device *dev, s64 offset, int whence )
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{
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ntfs_log_trace( "dev %p, offset %Li, whence %i\n", dev, offset, whence );
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD( dev );
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if ( !fd )
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{
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errno = EBADF;
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return -1;
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}
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// Set the current position on the device (in bytes)
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switch ( whence )
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{
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case SEEK_SET: fd->pos = MIN( MAX( offset, 0 ), fd->len ); break;
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case SEEK_CUR: fd->pos = MIN( MAX( fd->pos + offset, 0 ), fd->len ); break;
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case SEEK_END: fd->pos = MIN( MAX( fd->len + offset, 0 ), fd->len ); break;
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}
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return 0;
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_read( struct ntfs_device *dev, void *buf, s64 count )
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{
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return ntfs_device_gekko_io_readbytes( dev, DEV_FD( dev )->pos, count, buf );
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_write( struct ntfs_device *dev, const void *buf, s64 count )
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{
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return ntfs_device_gekko_io_writebytes( dev, DEV_FD( dev )->pos, count, buf );
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_pread( struct ntfs_device *dev, void *buf, s64 count, s64 offset )
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{
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return ntfs_device_gekko_io_readbytes( dev, offset, count, buf );
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_pwrite( struct ntfs_device *dev, const void *buf, s64 count, s64 offset )
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{
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return ntfs_device_gekko_io_writebytes( dev, offset, count, buf );
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_readbytes( struct ntfs_device *dev, s64 offset, s64 count, void *buf )
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{
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ntfs_log_trace( "dev %p, offset %Li, count %Li\n", dev, offset, count );
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD( dev );
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if ( !fd )
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{
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errno = EBADF;
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return -1;
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}
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// Get the device interface
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const DISC_INTERFACE* interface = fd->interface;
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if ( !interface )
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{
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errno = ENODEV;
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return -1;
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}
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if ( offset < 0 )
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{
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errno = EROFS;
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return -1;
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}
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if ( !count )
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return 0;
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sec_t sec_start = ( sec_t ) fd->startSector;
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sec_t sec_count = 1;
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u32 buffer_offset = ( u32 ) ( offset % fd->sectorSize );
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u8 *buffer = NULL;
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// Determine the range of sectors required for this read
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if ( offset > 0 )
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{
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sec_start += ( sec_t ) floor( ( f64 ) offset / ( f64 ) fd->sectorSize );
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}
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if ( buffer_offset + count > fd->sectorSize )
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{
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sec_count = ( sec_t ) ceil( ( f64 ) ( buffer_offset + count ) / ( f64 ) fd->sectorSize );
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}
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// If this read happens to be on the sector boundaries then do the read straight into the destination buffer
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if ( ( buffer_offset == 0 ) && ( count % fd->sectorSize == 0 ) )
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{
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// Read from the device
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ntfs_log_trace( "direct read from sector %d (%d sector(s) long)\n", sec_start, sec_count );
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if ( !ntfs_device_gekko_io_readsectors( dev, sec_start, sec_count, buf ) )
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{
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ntfs_log_perror( "direct read failure @ sector %d (%d sector(s) long)\n", sec_start, sec_count );
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errno = EIO;
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return -1;
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}
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// Else read into a buffer and copy over only what was requested
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}
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else
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{
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// Allocate a buffer to hold the read data
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buffer = ( u8* )ntfs_alloc( sec_count * fd->sectorSize );
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if ( !buffer )
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{
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errno = ENOMEM;
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return -1;
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}
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// Read from the device
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ntfs_log_trace( "buffered read from sector %d (%d sector(s) long)\n", sec_start, sec_count );
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ntfs_log_trace( "count: %d sec_count:%d fd->sectorSize: %d )\n", ( u32 )count, ( u32 )sec_count, ( u32 )fd->sectorSize );
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if ( !ntfs_device_gekko_io_readsectors( dev, sec_start, sec_count, buffer ) )
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{
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ntfs_log_perror( "buffered read failure @ sector %d (%d sector(s) long)\n", sec_start, sec_count );
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ntfs_free( buffer );
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errno = EIO;
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return -1;
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}
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// Copy what was requested to the destination buffer
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memcpy( buf, buffer + buffer_offset, count );
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ntfs_free( buffer );
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}
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return count;
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}
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/**
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*
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*/
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static s64 ntfs_device_gekko_io_writebytes( struct ntfs_device *dev, s64 offset, s64 count, const void *buf )
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{
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ntfs_log_trace( "dev %p, offset %lli, count %lli\n", dev, offset, count );
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD( dev );
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if ( !fd )
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{
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errno = EBADF;
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return -1;
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}
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// Get the device interface
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const DISC_INTERFACE* interface = fd->interface;
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if ( !interface )
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{
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errno = ENODEV;
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return -1;
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}
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// Check that the device can be written to
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if ( NDevReadOnly( dev ) )
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{
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errno = EROFS;
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return -1;
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}
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if ( count < 0 || offset < 0 )
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{
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errno = EROFS;
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return -1;
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}
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if ( count == 0 )
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return 0;
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sec_t sec_start = ( sec_t ) fd->startSector;
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sec_t sec_count = 1;
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u32 buffer_offset = ( u32 ) ( offset % fd->sectorSize );
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u8 *buffer = NULL;
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// Determine the range of sectors required for this write
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if ( offset > 0 )
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{
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sec_start += ( sec_t ) floor( ( f64 ) offset / ( f64 ) fd->sectorSize );
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}
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if ( ( buffer_offset + count ) > fd->sectorSize )
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{
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sec_count = ( sec_t ) ceil( ( f64 ) ( buffer_offset + count ) / ( f64 ) fd->sectorSize );
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}
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// If this write happens to be on the sector boundaries then do the write straight to disc
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if ( ( buffer_offset == 0 ) && ( count % fd->sectorSize == 0 ) )
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{
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// Write to the device
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ntfs_log_trace( "direct write to sector %d (%d sector(s) long)\n", sec_start, sec_count );
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if ( !ntfs_device_gekko_io_writesectors( dev, sec_start, sec_count, buf ) )
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{
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ntfs_log_perror( "direct write failure @ sector %d (%d sector(s) long)\n", sec_start, sec_count );
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errno = EIO;
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return -1;
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}
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// Else write from a buffer aligned to the sector boundaries
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}
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else
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{
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// Allocate a buffer to hold the write data
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buffer = ( u8 * ) ntfs_alloc( sec_count * fd->sectorSize );
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if ( !buffer )
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{
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errno = ENOMEM;
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return -1;
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}
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// Read the first and last sectors of the buffer from disc (if required)
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// NOTE: This is done because the data does not line up with the sector boundaries,
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// we just read in the buffer edges where the data overlaps with the rest of the disc
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if ( buffer_offset != 0 )
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{
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if ( !ntfs_device_gekko_io_readsectors( dev, sec_start, 1, buffer ) )
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{
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ntfs_log_perror( "read failure @ sector %d\n", sec_start );
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ntfs_free( buffer );
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errno = EIO;
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return -1;
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}
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}
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if ( ( buffer_offset + count ) % fd->sectorSize != 0 )
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{
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if ( !ntfs_device_gekko_io_readsectors( dev, sec_start + sec_count - 1, 1, buffer + ( ( sec_count - 1 ) * fd->sectorSize ) ) )
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{
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ntfs_log_perror( "read failure @ sector %d\n", sec_start + sec_count - 1 );
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ntfs_free( buffer );
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errno = EIO;
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return -1;
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}
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}
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// Copy the data into the write buffer
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memcpy( buffer + buffer_offset, buf, count );
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// Write to the device
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ntfs_log_trace( "buffered write to sector %d (%d sector(s) long)\n", sec_start, sec_count );
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if ( !ntfs_device_gekko_io_writesectors( dev, sec_start, sec_count, buffer ) )
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{
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ntfs_log_perror( "buffered write failure @ sector %d\n", sec_start );
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ntfs_free( buffer );
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errno = EIO;
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return -1;
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}
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// Free the buffer
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ntfs_free( buffer );
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}
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// Mark the device as dirty (if we actually wrote anything)
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NDevSetDirty( dev );
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return count;
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}
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static bool ntfs_device_gekko_io_readsectors( struct ntfs_device *dev, sec_t sector, sec_t numSectors, void* buffer )
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{
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD( dev );
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if ( !fd )
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{
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errno = EBADF;
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return false;
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}
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// Read the sectors from disc (or cache, if enabled)
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if ( fd->cache )
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return _NTFS_cache_readSectors( fd->cache, sector, numSectors, buffer );
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else
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return fd->interface->readSectors( sector, numSectors, buffer );
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return false;
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}
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static bool ntfs_device_gekko_io_writesectors( struct ntfs_device *dev, sec_t sector, sec_t numSectors, const void* buffer )
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{
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// Get the device driver descriptor
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gekko_fd *fd = DEV_FD( dev );
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if ( !fd )
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{
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errno = EBADF;
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return false;
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}
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// Write the sectors to disc (or cache, if enabled)
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if ( fd->cache )
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return _NTFS_cache_writeSectors( fd->cache, sector, numSectors, buffer );
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else
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return fd->interface->writeSectors( sector, numSectors, buffer );
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return false;
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}
|
|
|
|
/**
|
|
*
|
|
*/
|
|
static int ntfs_device_gekko_io_sync( struct ntfs_device *dev )
|
|
{
|
|
gekko_fd *fd = DEV_FD( dev );
|
|
ntfs_log_trace( "dev %p\n", dev );
|
|
|
|
// Check that the device can be written to
|
|
if ( NDevReadOnly( dev ) )
|
|
{
|
|
errno = EROFS;
|
|
return -1;
|
|
}
|
|
|
|
// Mark the device as clean
|
|
NDevClearDirty( dev );
|
|
|
|
// Flush any sectors in the disc cache (if required)
|
|
if ( fd->cache )
|
|
{
|
|
if ( !_NTFS_cache_flush( fd->cache ) )
|
|
{
|
|
errno = EIO;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
*
|
|
*/
|
|
static int ntfs_device_gekko_io_stat( struct ntfs_device *dev, struct stat *buf )
|
|
{
|
|
ntfs_log_trace( "dev %p, buf %p\n", dev, buf );
|
|
|
|
// Get the device driver descriptor
|
|
gekko_fd *fd = DEV_FD( dev );
|
|
if ( !fd )
|
|
{
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
// Short circuit cases were we don't actually have to do anything
|
|
if ( !buf )
|
|
return 0;
|
|
|
|
// Build the device mode
|
|
mode_t mode = ( S_IFBLK ) |
|
|
( S_IRUSR | S_IRGRP | S_IROTH ) |
|
|
( ( !NDevReadOnly( dev ) ) ? ( S_IWUSR | S_IWGRP | S_IWOTH ) : 0 );
|
|
|
|
// Zero out the stat buffer
|
|
memset( buf, 0, sizeof( struct stat ) );
|
|
|
|
// Build the device stats
|
|
buf->st_dev = fd->interface->ioType;
|
|
buf->st_ino = fd->ino;
|
|
buf->st_mode = mode;
|
|
buf->st_rdev = fd->interface->ioType;
|
|
buf->st_blksize = fd->sectorSize;
|
|
buf->st_blocks = fd->sectorCount;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
*
|
|
*/
|
|
static int ntfs_device_gekko_io_ioctl( struct ntfs_device *dev, int request, void *argp )
|
|
{
|
|
ntfs_log_trace( "dev %p, request %i, argp %p\n", dev, request, argp );
|
|
|
|
// Get the device driver descriptor
|
|
gekko_fd *fd = DEV_FD( dev );
|
|
if ( !fd )
|
|
{
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
// Figure out which i/o control was requested
|
|
switch ( request )
|
|
{
|
|
|
|
// Get block device size (sectors)
|
|
#if defined(BLKGETSIZE)
|
|
case BLKGETSIZE:
|
|
{
|
|
*( u32* )argp = fd->sectorCount;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// Get block device size (bytes)
|
|
#if defined(BLKGETSIZE64)
|
|
case BLKGETSIZE64:
|
|
{
|
|
*( u64* )argp = ( fd->sectorCount * fd->sectorSize );
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// Get hard drive geometry
|
|
#if defined(HDIO_GETGEO)
|
|
case HDIO_GETGEO:
|
|
{
|
|
struct hd_geometry *geo = ( struct hd_geometry* )argp;
|
|
geo->sectors = 0;
|
|
geo->heads = 0;
|
|
geo->cylinders = 0;
|
|
geo->start = fd->hiddenSectors;
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
// Get block device sector size (bytes)
|
|
#if defined(BLKSSZGET)
|
|
case BLKSSZGET:
|
|
{
|
|
*( int* )argp = fd->sectorSize;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// Set block device block size (bytes)
|
|
#if defined(BLKBSZSET)
|
|
case BLKBSZSET:
|
|
{
|
|
int sectorSize = *( int* )argp;
|
|
fd->sectorSize = sectorSize;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// Unimplemented ioctrl
|
|
default:
|
|
{
|
|
ntfs_log_perror( "Unimplemented ioctrl %i\n", request );
|
|
errno = EOPNOTSUPP;
|
|
return -1;
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Device operations for working with gekko style devices and files.
|
|
*/
|
|
struct ntfs_device_operations ntfs_device_gekko_io_ops =
|
|
{
|
|
.open = ntfs_device_gekko_io_open,
|
|
.close = ntfs_device_gekko_io_close,
|
|
.seek = ntfs_device_gekko_io_seek,
|
|
.read = ntfs_device_gekko_io_read,
|
|
.write = ntfs_device_gekko_io_write,
|
|
.pread = ntfs_device_gekko_io_pread,
|
|
.pwrite = ntfs_device_gekko_io_pwrite,
|
|
.sync = ntfs_device_gekko_io_sync,
|
|
.stat = ntfs_device_gekko_io_stat,
|
|
.ioctl = ntfs_device_gekko_io_ioctl,
|
|
};
|